s=bat;
bat loads the 'bat' signal. It is a 400 samples long recording of a bat chirp sampled with a sampling period of 7 microseconds. This gives a sampling rate of 143 kHz.
[sig,fs]=bat additionally returns the sampling frequency fs.
The signal can be obtained from http://dsp.rice.edu/software/bat-echolocation-chirp
Please acknowledge use of this data in publications as follows:
The author wishes to thank Curtis Condon, Ken White, and Al Feng of the Beckman Institute of the University of Illinois for the bat data and for permission to use it in this paper.
Plot of 'bat' in the time-domain:
plot((1:400)/143000,bat);
xlabel('Time (seconds)');
ylabel('Amplitude');
Plot of 'bat' in the frequency-domain:
plotfftreal(fftreal(bat),143000,90);
Plot of 'bat' in the time-frequency-domain:
sgram(bat,143000,90);